Built especially for drain tubes or through-hull fittings measuring 1" - 1.25", the Marine Raider⢠Flush Scupper Adapter is made of durable plastic and rubber and has grooves on the inside to fit over a drain flange. Plus, it's corrosion resistant to stand up to harsh environments. Marine Raider⢠Flush Scupper Adapter White - Marine Accessories at Academy Sports